Oil-quenching apparatus.



N0. 696,0l4. Patented Mar. 25, I902.

m. E. DUNA LLY. OIL QUENCHING APPARATUS.

(Application filed Nov. 20, 1900.)

(No Model) n STATES PATENT OFFICE.

MELVIN E. DONALLY, OF BROOKLYN, NE\V YORK.

OlL-QUENCHING APPARATUS.

SPECIFICATION forming part Of Letters Patent NO. 696,014, dated March25, 1902.

Application filed November 20, 1900- Serial No- 3'7,108- (N0 model.)

To all whom it may concern:

Be it known that I, MELVIN E. DONALLY, a citizen of the Dominion ofCanada, residing in the borough of Brooklyn, city of New York, State ofNew York, have invented certain new and useful Improvements inOil-Quenching Apparatus, of which the following is a specification,reference being had to the accompanying drawings, forming a part hereof.

In the process of oil-quenching the articles to be tempered are throwninto a tank of oil, which naturally becomes heated excessively unlessmeans are provided for keeping down the temperature of the oil. Variousmeans have been employed hitherto for this purpose, but have beeneifective only to a moderate extent.

It is the object of this invention to provide improved means for keepingdown the temperature of the oil, so that a tank can be used continuouslyand have a much greater output for a given size than has been possiblehitherto.

The invention will be more fully described hereinafter with reference tothe accompanying drawings, in which- Figure 1 is a plan view of anoil-quenching apparatus constructed in accordance with the invention.Fig. 2 is a view of the same, partly in side elevation and partly invertical section, on the plane indicated by the broken line 2 2 ofFig. 1. Fig. 3 is a vertical detail section on the plane indicated bythe line 3 3 of Fig. 2.

In the apparatus shown in the drawings the tank, which may have anysuitable dimensions, is represented at a. At any convenient point nearthe bottom of the tank is connected a suitable pipe or channel,preferably having a horizontal portion 19 and a vertical orsubstantially vertical portion 0, the diameter of the vertical portionbeing preferably reduced, as clearly shown in Fig. 2. The tube orconductor 0 opens into the lower end of a pipe d, which forms acontinuation of the tube or pipe 0 and is preferably ofconsiderably-larger diameter and is carried up to a considerable heightabove the tank, this pipe being represented in Fig. 2 as broken out inorder to save space on the drawing. Within the pipe cl may be placeddeflectors or dash-plates 6, although they are not essential. Ifemployed and placed in the position represented in Fig. 2, suitableopenings f should be provided to permit the return of oil to the lowerend of the pipe, as hereinafter explained. The bottom of the pipe isalso provided with a suitable opening g, through which the oil isreturned to the tank, the bottom of the pipe being suitably inclined, asindicated by dotted lines in Fig. 2, to direct the oil toward theopening g. A pipe h, which is connected to a suitable blower i, isintroduced within the pipe 0, preferably terminating somewhat be low theupper end of the reduced portion thereof, and in any case below thenormal. level of the oil in the tank a.

In the operation of the improved apparatus, the tank having been filledwith oil substantially to or slightly above the level of the top of pipeh a strong blast of air is introduced through the pipe h. As thisair-blast leaves the month of the pipe h it drives before it or carrieswith it in a divided condition, to which the term spray may be applied,be the drops large or small, such oil as runs over the mouth of thepipe. The oilspray is carried upward within the pipe at by the strongcurrent of air and is thoroughly cooled. Eventually the spray gathers orcondenses within the pipe d and runs down within the pipe, beingreturned to the tank a through the opening g, above mentioned, andmingling with the oil in the tank keeps the temperature thereof down tothe proper degree. It will be observed that a constant circulation ofthe oil is maintained by the action of the air-blast, the oil enteringthe pipe 19 from the bottom of the tank a to take the place of the oilwhich is carried upward in the'pipe d in the form of spray and issubsequently condensed and returned to the tank.

I claim as my invention- 1. In an oil-quenching apparatus thecombination with a tank of a pipe connected therewith near the bottom apipe carried upward to a considerable height above and forming acontinuation of the first-named pipe and having an opening through whichthe oil may be returned to the tank, and means for introducing anair-blast within the first-named pipe, whereby the oil is carried upwardin the form of spray within the last-named pipe minating within thereduced portion of the first-named pipe below the level of the oil inthe tank, and means for creating an air-blast 15 through said air-pipe,substantially as shown and described.

This specification signed and witnessed this 17th day of November, A. D.1900.

MELVIN E. DONAL-LY.

In presence of- A. N. J ESBERA, W. B. GREELEY.

